Owee, I'm MrMeeseeks, Look at me.

There seem to be a conflict, please backport manually. Here are approximate instructions:

1. Checkout backport branch and update it.

$ git checkout v3.4.x
$ git pull

2. Cherry pick the first parent branch of the this PR on top of the older branch:

$ git cherry-pick -m1 75c425c425d5d4914133cb935a3419e2ad1b6116

3. You will likely have some merge/cherry-pick conflict here, fix them and commit:

$ git commit -am 'Backport PR #20238: Clarify docstring of ScalarMappable.set/get_array()'

4. Push to a named branch :

git push YOURFORK v3.4.x:auto-backport-of-pr-20238-on-v3.4.x

5. Create a PR against branch v3.4.x, I would have named this PR:

"Backport PR #20238 on branch v3.4.x"

And apply the correct labels and milestones.

Congratulation you did some good work ! Hopefully your backport PR will be tested by the continuous integration and merged soon!

If these instruction are inaccurate, feel free to suggest an improvement.

@timhoffm I don't see why this needs to be in 3.4.3 so I'm re-milestoning. But feel free to do the back port if you would like.